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Percent Concentration
Solution Percent Concentration ICS
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Percent Concentration
Describes the amount of solute dissolved in 100 parts of solution amount of solute 100 parts solution ICS
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Mass-Mass % Concentration
mass/mass % = g solute x 100% g solution ICS
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Mixing Solute and Solvent
Solute Solvent 4.0 g KCl g H2O 50.0 g KCl solution ICS
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Calculating Mass-Mass %
g of KCl = g g of solvent = g g of solution = g %(m/m) = 4.0 g KCl (solute) x 100 = 8.0% KCl 50.0 g KCl solution ICS
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Learning Check PC1 A solution contains 15 g Na2CO3 and 235 g of H2O? What is the mass % of the solution? 1) 15% (m/m) Na2CO3 2) 6.4% (m/m) Na2CO3 3) 6.0% (m/m) Na2CO3 ICS
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Solution PC1 mass solute = 15 g Na2CO3
mass solution = 15 g g = 250 g %(m/m) = 15 g Na2CO3 x g solution = 6.0% Na2CO3 solution ICS
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Mass-Volume % mass/volume % = g solute x 100% 100 mL solution ICS
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Learning Check PC2 An IV solution is prepared by dissolving 25 g glucose (C6H12O6) in water to make 500. mL solution. What is the percent (m/v) of the glucose in the IV solution? 1) 5.0% 2) 20.% 3) 50.% ICS
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Solution PC2 1) 5.0% %(m/v) = 25 g glucose x 100 500. mL solution
= %(m/v) glucose solution ICS
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Writing Factors from % A physiological saline solution is a 0.85% (m/v) NaCl solution. Two conversion factors can be written for the % value. 0.85 g NaCl and mL NaCl soln 100 mL NaCl soln g NaCl ICS
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% (m/m) Factors NaOH and NaOH soln
Write the conversion factors for a 10 %(m/m) NaOH solution NaOH and NaOH soln NaOH soln NaOH ICS
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% (m/m) Factors NaOH and NaOH soln 10 g 100 g 100 g 10 g
Write the conversion factors for a 10 %(m/m) NaOH solution NaOH and NaOH soln NaOH soln NaOH 10 g 100 g 100 g 10 g ICS
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Learning Check PC 3 Write two conversion factors for each of the following solutions: A. 8 %(m/v) NaOH B. 12 %(v/v) ethyl alcohol ICS
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Solution PC 3 Write conversion factors for the following:
A. 8 %(m/v) NaOH 8 g NaOH and 100 mL 100 mL g NaOH B. 12 %(v/v) ethyl alcohol 12 mL alcohol and mL 100 mL mL alcohol ICS
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Using % Factors How many grams of NaCl are needed to prepare 250 g of a 10.0% (m/m) NaCl solution? Complete data: ____________ g solution ____________% or (______/_100 g_) solution ____________ g solute ICS
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Calculation using % factors
g solution 10.0% or (10.0 g/100 g) solution ? g solute 250 g NaCl soln x g NaCl = 25 g NaCl g NaCl soln ICS
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Learning Check PC4 How many grams of NaOH do you need to measure out to prepare 2.0 L of a 12%(m/v) NaOH solution? 1) 24 g NaOH 2) 240 g NaOH 3) 2400 g NaOH ICS
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Solution PC4 2.0 L soln x 1000 mL = 2000 mL soln 1 L
12 % (m/v) NaOH = g NaOH 100 mL NaOH soln 2000 mL x 12 g NaOH = g NaOH ICS
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Learning Check PC5 1) 30 mL 2) 3000 mL 3) 7500 mL
How many milliliters of 5 % (m/v) glucose solution are given if a patient receives 150 g of glucose? 1) 30 mL 2) mL 3) mL ICS
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Solution PC5 5% m/v factor 150 g glucose x 100 mL = 3000 mL
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